GCSE Secondary Maths Age 13-17 - Geometry & Measures: Enlargement - Explained

The video tutorial explains how to enlarge a triangle on a graph using a negative scale factor of -1.5, centered at (0, 2). It details the process of enlarging each vertex by going through the center of enlargement and extending to the opposite side. The tutorial highlights the properties of negative enlargement, such as flipping and rotating the shape, and discusses the marking criteria for correct size, shape, and orientation.

What is the first step in performing a negative enlargement on a graph?

• Calculate the scale factor

• Shade the enlarged shape

• Draw the triangle

• Identify the center of enlargement

When enlarging a shape with a negative scale factor, what direction do you move through the center of enlargement?

• Through the center to the opposite side

• Away from the center

• In a circular motion around the center

• Towards the center

How do you determine the new position of a vertex when using a negative scale factor?

• Multiply the distance by the scale factor and move in the same direction

• Subtract the scale factor from the coordinates

• Multiply the distance by the scale factor and move to the opposite side

• Add the scale factor to the coordinates

What method is used to handle the more complex vertex during enlargement?

• Guesswork

• Approximation

• Measurement

• Estimation

What happens to a shape when it is enlarged with a negative scale factor?

• It disappears

• It shrinks and stays in the same orientation

• It flips and rotates

• It becomes larger but stays in the same orientation

What are the criteria for earning full marks on a negative enlargement task?

• Correct size and shape only

• Correct orientation only

• Correct size and orientation only

• Correct size, shape, and orientation

What is the main focus of question 13 in the video?

• Calculating scale factors

• Drawing accurate graphs

• Knowledge of negative enlargement

• Understanding positive enlargement